Originally I was going to post this as a new guild idea, but it seems more prudent to make a topic that is more general so others can participate without going off topic.
Design space is the most broad of idea infusions. If you come up with something that doesn't exist right now, the design space in that is rarely the idea itself, but the area it addresses. For a specific example, let's go with "A skill that allows you to resist stunning." Here the design space is not in the skill itself, but the ability to allow someone to 'resist stun'. Another example: "A spell that heals everyone in the party" gives us the design space for things that have an effect in parties.
Do you have any ideas? Post specific or design space style ideas here!